To ‘use’ one, a magic user (or essentially magical being) must hold the lump in his/her/its hand and concentrate on the task to be performed. The potency of the arcanum is transferred to the task, and the lump becomes an inert piece of orange mineral.

The following are tasks to which arcanum can be put:

1. Recharging a charged magic item: One lump restores 2-8 charges.
2. Enhancing either the effect, range, or duration of a single spell by 50%: The spell to be enhanced must be cast within 5 minutes of the “use” of the arcanum.
3. Recalling a cast spell: The caster is able to recall and recast a single spell that he/she has already cast that day.
4. Adding a one-time bonus of +2 to any roll.